JP2007508883A - Protected injection syringe device - Google Patents

Abstract

  The device of the present invention comprises a syringe (10, 11, 12) and safety means. The safety means comprises a protective sheath (16) that can take both an injection shape and a protective shape relative to the position of the syringe body. In the injection configuration, the needle (11) of the syringe protrudes beyond the sheath, and in the protection configuration, the needle fits inside the sheath. The device includes a trigger member (30) that allows the device to transition from an injection shape to a protective shape at the end of an injection stroke. The device comprises means (34) for defining the first and second injection end states, and in the first state, the trigger member (30) transitions the device from the injection shape to the protective shape. In the second state, such a transition is possible.

Description

  The present invention relates to a safe injection device provided with a syringe and safety means, and the syringe has a syringe body, a needle, and a piston suitable for performing injection by moving in the body. The safety means comprises a protective sheath, the syringe body and the protective sheath are suitable for sliding relative to each other to navigate between the injection shape and the protective shape, in which the needle is placed around the syringe body In the protective shape, the needle fits inside the sheath, and the injection device has a trigger suitable for moving the injection device from the injection shape to the protective shape at the end of the injection stroke. A member is included.

  A device of this type is known, for example, from patent documents FR 2801705, EP 0966833 and also from EP 0740942.

  In order to inject the liquid contained in the syringe body into the patient body, the syringe body and the protective sheath need to be in an injection shape. After the injection, the trigger members act to move them to a protective shape and prevent the user from accidentally sticking the needle, thereby limiting the risk of contamination.

  The patent application company has realized that there are situations where it is desirable to prevent the device from taking the injection shape at the end of the injection stroke. An example where this is the case is when using a device where the syringe is not pre-filled and the syringe needs to be operated before injection. In order to fill such a syringe, first, a piston is arranged at the end point of the forward strike, and then the piston is moved backward from the above state, that is, away from the needle, the injection solution is placed in the syringe body. It needs to penetrate. And during such filling and subsequent injections, it is appropriate that the syringe body and the protective sheath remain in the injection shape.

  The object of the present invention is to provide a safe injection device of the above type, in which the transition to the protective shape is triggered at the end of the injection stroke, but not necessarily at the end of all injection strokes. I don't mean.

  This goal is achieved by the following facts. That is, the device of the present invention includes means for defining the first and second injection end states, and in the first state, the trigger member causes the device to transition from the injection shape to the protection shape. In the second state, the trigger member is suitable for such a transition.

  If there is a syringe operation before injection, the first injection stroke end state is defined during the operation, so that the device is not timely transferred to the protective shape. During the injection, a second injection end state is defined.

  Advantageously, the device further comprises an obstruction member, which is suitable for occupying an obstruction position where the injection end state is the first state and is moved from the obstruction position. Thereby, it is also suitable for enabling the end of the injection stroke to be the second state.

  It is preferable that the inhibition member constitutes a part that is easy to operate and is initially in the inhibition position.

  In a first advantageous embodiment, the trigger member is forcibly moved by the piston, and the apparatus further includes means for defining first and second injection end positions for the piston. The first and second end positions correspond to first and second injection end states, respectively.

  It is preferable to prepare for a situation where the two injection striking end positions of the piston are close to each other, so that the syringe body contains almost no air or liquid at either position.

  As an advantage under such circumstances, the device includes abutment means, which are actuated to activate and define a first injection end position. Thus, it is suitable for making it possible to reach the second injection end position.

  When these abutting means are in operation, the abutting means defines a first injection end position for the piston, and at the first position, the tip of the piston is located on the syringe body with the needle. Although located near the front end, it nevertheless does not reach the front end. In contrast, if the abutment means is not activated, the tip of the piston can advance to a position slightly beyond the first injection end position.

  Advantageously, the blocking member is connected to the piston in the blocking position and is forced to move with the piston. Further, the inhibition member is suitable for defining the first injection hitting end position in cooperation with the apparatus element stationary against the position of the syringe body.

  Since the blocking member is initially in the blocking position, if the piston is pushed forward until the blocking member comes into contact, the first injection stroke end position is automatically reached. In order to be able to reach the second injection end position, it is sufficient to move the inhibition member by moving it behind the piston or, for example, by detaching the inhibition member from the piston. As a result, at the end of injection into the patient, the piston can reach the second injection end position.

  In a second advantageous embodiment, the trigger member is connected to the piston and is moved relative to the position of the piston so as to travel between a suitable position for the trigger and an unsuitable position. Suitable for, at the suitable position, at the end of the piston injection stroke, the trigger member is suitable for transferring the device from the injection shape to the protective shape, and at the unsuitable position, at the end of the piston injection stroke, the trigger member Is not suitable for such a transition.

  Under such circumstances, the trigger member is placed in an unsuitable position for the trigger while the device is operated prior to injection. When these operations are complete and then the syringe is ready for injection, the trigger member is placed in a suitable position for the trigger, so that a protective shape is achieved at the end of the injection.

  An advantage of this situation is that the trigger member can be moved axially relative to the position of the piston, so that a suitable position for the trigger can be moved from a position that is not suitable for the trigger. Offset towards the side end.

  The invention can be better understood and the advantages of the invention can be further understood by reading the following detailed description of the embodiments shown as non-limiting examples. The description refers to the accompanying drawings.

  The apparatus shown in the drawing includes a syringe body 10, a needle 11, and a syringe including a piston 12 that can slide to perform injection. 1 and 2, the piston 12 is in an injection ready position, in which the piston tip 12A is located near the rear end 10B of the syringe body 10, ie, the end far from the needle.

  A device prior to injection is shown, and the needle 11 is protected in a conventional manner by a protective cap 14 attached to the front end 10A of the syringe body 10.

  The device also comprises a safety means with a protective sheath 16.

  In FIGS. 1 to 5 and 7, the protective sheath 16 is in the preparation position and is disposed around the syringe body 10. This is an injection shape. FIGS. 6 and 8 show the state after the sheath 16 is triggered to be displaced with respect to the position of the syringe body 10, and the sheath protrudes beyond the front end 10A of the syringe body, and the needle 11 is placed inside the sheath. You can see that This is a protective shape.

  The protective means in the illustrated example is similar to that disclosed in the patent document FR2801795, so that at the end of the injection, the sheath 16 moves relative to the syringe body and advances to be positioned around the needle. Become.

  More precisely, the syringe body is contained in the support sheath 18, and the protective sheath 16 is retracted inside the support sheath while in the preparation position, and is contained in the annular space between the syringe body and the support sheath. .

  The rear end of the support sheath 18 is formed by the distal portion 20, and the action of the portion allows the collar 10B 'to remain at the rear end so that the syringe body is held in a stationary manner inside the support sheath. it can. More precisely, as can be seen in FIG. 3, the part 20 has a radial wall element 22 forming a shoulder part facing the rear, where the syringe body does not move forward relative to the support sheath. In such a way, the collar 10B 'is caught. The portion 20 also includes a retaining tongue 24, which is resilient, after having been radially expanded until the collar 10B 'is inserted into the portion 20 and reaches the shoulder portion 22, initially. Return to position and hold the collar to prevent backward slip.

  Further, in the section of the rear end of the sheath 18 connected to the portion 20, there is a rearward facing inner shoulder 19, and in the injection shape, the elastic tab 17 at the rear end of the protective sheath 16 is engaged with the shoulder so that the protective sheath is Do not move forward.

  As seen in FIG. 2, the portion 20 has a drive tab 26 arranged to face the tab 17.

  The protective sheath 16 has a step 17 ′ in the vicinity of the rear end thereof, and forms an inner shoulder facing the front end of the spring 28 in the rearward direction. The rear end of the spring is caught on the front surface of the wall element constituting the shoulder portion 22. Thus, in the injection configuration, the spring 28 is compressed.

  The rear head 12B of the piston 12 has a skirt 30 that constitutes a trigger member for shifting the device to a protective shape.

  As seen in FIG. 6, when the piston 12 fully enters the inside of the syringe body 10, the skirt front end 30A is interlocked with the resilient tab 26 so that the tab faces inward, ie toward the axis A of the device. Push radially, so that these tabs push the protective sheath tabs 17 inward as well. As a result, the sheath is no longer held by the shoulder 19 and can advance under the thrust from the spring 28 to reach the position shown in FIG. In this position, the device is in a protective shape.

  The safety means described above corresponds to that defined in the patent document FR2801795. While the syringe body is stationary, the protective sheath advances ahead of the syringe body to achieve the protective shape. Of course, the present invention also applies to the reverse device, in which the syringe body moves rearward of the protective sheath to define the protective shape.

  In either situation, a protective shape is obtained at the end of injection.

  The device of the present invention includes means for defining two different states at the end of the injection stroke, one state does not trigger the injection shape and the other occurs the trigger.

  In the example of FIGS. 1-6, the trigger member constituted by the skirt 30 is forcibly moved by the piston 12, and the first and second injection end states are respectively for the piston at the end of the injection hit. Corresponding to the first and second positions.

  The first injection end position is shown in FIGS. 4 and 5, and it can be seen that the tip 12A of the piston 12 is not completely in contact with the front end 10A of the syringe body. The spacing 32 between these two ends is exaggerated in the figure to improve the understanding of the present invention. Nevertheless, this separation is very small, and it is possible to prepare for a situation where the tip of the piston contacts the wall formed at the front end 10A of the syringe body at the first injection end position. This is because the tip E of the piston is formed by a flexible part, e.g. made of elastomer, and exhibits a deformability that can be slightly compressed, so that in the second end-of-stroke configuration, This is because the piston can further move forward to occupy the second injection end position as shown in FIG.

  In the first embodiment, the apparatus includes an obstruction member 34, which is depicted in the obstruction position connected to the head 12B of the piston 12 in FIGS. In the example shown, the blocking member 34 is formed by a head component 34 attached to the piston head 12B in the blocking position and can be detached from the head so that the piston is in the second injection end position. Can be reached. More precisely, in the inhibition position shown in FIGS. 1-5, the inhibition member 34 penetrates the piston head. The head has a slot 36 for this purpose. Passing through this slot is the longitudinal portion of the part 34 formed by the tenon or wall element 38. The front end 38A of the hozo or wall element thus enters the space inside the piston head formed between the inner surface of the skirt 30 and the piston rod. In the obstructed position of the part 34, the hoso 38 advances further from the piston head 12B toward the tip of the piston further than the skirt 30.

  As shown in FIG. 4, the front end 38 </ b> A of the wall element 38 of the blocking member 34 abuts on the rear end 10 </ b> B of the syringe body 10 to define the first injection hitting end position. In order to move the piston forward, the user naturally pushes the blocking member 34, more precisely the drive head 39 of the member. In the position of FIG. 4, it should be understood that there is no further effect on the thrust P applied to the head 39.

  In order to define the first injection end position, it is recommended to note that the blocking member should also be able to cooperate while abutting device elements other than the rear end of the syringe body. The blocking member should be able to cooperate with an element that is stationary relative to the position of the syringe body, in particular with an appropriate portion of the outer sheath 18 or portion 20.

  In the embodiment of FIGS. 1-6, it is sufficient to disconnect this blocking member 34 from the piston head in order to be able to reach the second injection end position. This is shown in FIG. 6, in which the obstruction is removed and thus the skirt 30 can contact the drive tab 26, but this contact was not possible until FIG.

  It should be possible to change the shape of the piston head and the obstruction member without exceeding the scope of the present invention. As a result, the blocking member can be moved rearwardly of the head from the blocking position in such a way as to set back the front end 38A so that the blocking member is no longer behind the syringe body at the end of the injection. Thus, the second injection hitting end position can be reached without contacting the end. In order to hold the obstruction member in this setback position, it should be possible to interlock the obstruction member with the piston head, for example, by an insertion mechanism or the like.

  As seen in FIG. 6, in the example shown, a housing 40 is formed by the space inside the portion 20, and in the second injection end position, the piston head 12B is generally retracted into the housing, and the piston Is no longer usable at all or almost. However, it can be seen in FIGS. 4 and 5 that the piston head protrudes beyond this housing at the first injection end position. Thus, the user can get a clue and pull the piston back to prepare the device for injection.

  Figures 7 and 8 show a second embodiment of the means enabling the achievement of the first and second end-of-injection conditions, which will be described hereinafter. In these figures, the trigger member is formed by the skirt 52 of the cover 50, which is arranged around the piston head 12B and can be moved relative to the position of the head.

  FIG. 7 shows the cover 50 in an unsuitable position for triggering, in which the cover is set back behind the head 12B. Thus, the front end 52A of the skirt 52 does not come into contact with the drive tab 26 at the end of the injection stroke. For clarity of explanation, FIGS. 7 and 8 show the drive tabs 26 in broken lines, even though they are not in the cut plane of these figures.

  In contrast, in FIG. 8, the cover 50 is advanced over the piston head 12B so that at the end of the injection stroke, the skirt 52 is in the same manner as the skirt 30 of the above embodiment shown in FIG. It can be interlocked with the tongue 26 via the front end of the skirt.

  Advantageously, the sliding stroke of trigger member 50 relative to piston 12 includes a hard point to hold the trigger member in a position that is not suitable for triggering. Specifically, there is a snap-in bead 53 on the inner wall of the skirt 52, and this bead 53 is formed on the outer wall of the skirt 30 of the head 12B in a position not suitable for triggering as shown in FIG. Held between the two beads 54A and 54B. In order to be able to drive the piston without moving the cover 50 forward, a wall at the rear end of the cover has a central opening 56 so that the user can insert a finger and push the piston head 12B directly. It is recommended to be careful.

  By operating the cover 50 held by the bead 54B so as not to move backward, the piston can be moved backward from the state shown in FIG.

  When the piston head is moved backward and a space is formed between the support sheath 18 and the user holds the piston rod between the two fingers, the user pushes the component 50 forward with another finger, You can pass through the hard points. Specifically, when there is another bead 56A near the front end of the outer wall of the skirt 30 and the cover 50 is in a position suitable for triggering, the bead 53 of the skirt 52 is placed in front of this bead 56A. The

  It is the piston head skirt 30 that prevents the piston from moving forward beyond the first injection end position as shown in FIG. 7 when the cover 50 is in an unsuitable position for triggering. It can be seen that this is the front end 30A. This is done by cooperating in contact with an element stationary with respect to the position of the syringe body, specifically an element constituted by the rear end of the tongue 24.

  Means (inhibiting member 54 or triggering member 50) that help to prevent the device from always shifting to the protective shape at the end of the injection in relation to the piston are fixed to the piston head in the example shown, It can be detached from the head or moved relative to the position of the head, thereby achieving a second end-of-injection state. In the two examples above, these means are outside the piston. Using a member inside the piston, for example by passing it through a hollow piston rod, optionally abutting against a stationary element of the device, for example the collar of a syringe, or an element fixed to the piston 20 Of course, it seems possible.

In the illustration of the device according to the invention, a longitudinal section is shown, the syringe body and the protective sheath being shown in injection form. FIG. 2 is a partial view of the apparatus of FIG. 1, which is a cross-sectional view taken along line II-II of FIG. 1. It is the fragmentary perspective view seen from the back of this apparatus, and is the figure seen along the arrow III of FIG. FIG. 1 is a view similar to FIGS. 1 and 2 showing the first injection end state. It is a figure similar to FIG. 1 and 2, and is a fragmentary sectional view which shows the 1st injection strike completion state. It is a figure of the cut surface same as FIG. It is a figure similar to FIG. 4 of 2nd Embodiment. It is a figure similar to FIG. 6 of 2nd Embodiment.

Claims (14)

A safe injection device comprising a syringe and a safety means, wherein the syringe moves in the syringe body (10), the needle (11), and the piston (12) suitable for injection within the body. Wherein the safety means comprises a protective sheath (16), the syringe body and the protective sheath (16) being suitable for sliding relative to each other to travel between the injection shape and the protection shape, The needle (11) protrudes beyond the protective sheath (16) disposed around the syringe body (10), and in the protective shape, the needle is inside the sheath, and the injection device A trigger member (30) suitable for moving the injection device from the injection shape to the protective shape at the end of striking,
The trigger member (30) is fixed to the drive head (12B) of the piston (12), and the injection device includes an inhibition member (34) suitable for occupying an inhibition position, and the inhibition A member defines, in the same position, a first injection end position for the piston, in which the trigger member (30) moves the injection device from the injection shape to the protective shape. Suitable for allowing the piston to reach a second end-of-injection position, in which the trigger member (30 ) Is suitable for moving the injection device from the injection shape to the protective shape, in the inhibition position, an inhibition member (34) is connected to the piston (12) and connected to the piston. Suitable for defining the first injection end position by cooperating while abutting on the stationary device element (10B) with respect to the position of the syringe body (10). The blocking member (34) is suitable for being separated from the piston (12) or displaced from the position of said piston, thereby allowing the second injection end position to be reached, and In the inhibition position, the injection member is characterized in that the inhibition member (34) is connected to the drive head (12B) of the piston.   Device according to claim 1, characterized in that, in the blocking position, the blocking member (34) penetrates the head (12B) of the piston (12). A safe injection device comprising a syringe and a safety means, wherein the syringe moves in the syringe body (10), the needle (11), and the piston (12) suitable for injection within the body. Wherein the safety means comprises a protective sheath (16), the syringe body and the protective sheath (16) being suitable for sliding relative to each other to travel between the injection shape and the protection shape, The needle (11) protrudes beyond the protective sheath (16) disposed around the syringe body (10), and in the protective shape, the needle is inside the sheath, and the injection device A trigger member (30) suitable for moving the injection device from the injection shape to the protective shape at the end of striking,
The injection device includes means (34, 50) for defining first and second injection end states, and in the first state, the trigger member moves the injection device from the injection shape. Not suitable for transitioning to the protective shape, and in the second state, the trigger member (30) is suitable for transitioning the injection device from the injection shape to the protective shape; 30) is forcibly moved by the piston (12), the injection device includes means (34) for defining first and second injection end positions for the piston (12). The first and second positions correspond to first and second injection stroke end states, respectively, the injection device includes a housing (40), and in the second injection stroke end position, In the housing, a piston 12) the head (12B) is generally retracted, and in the first injection end position, the piston head protrudes beyond the housing, and the piston can be pulled away from the needle using the head as a clue. An injection device characterized in that it can be used.   The injection device includes an obstruction member (34), which is suitable for occupying an obstruction position where the injection end state becomes the first state, and is moved from the obstruction position, thereby 4. The injection device according to claim 3, wherein the injection device is also suitable for enabling an injection striking end state to be the second state.   The injection device includes abutment means (38A, 10B), wherein the abutment means is activated to define a first injection end position, and is not activated thereby. The injection device according to claim 3, wherein the injection device is suitable for reaching a second injection hitting end position.   In the blocking position, the blocking member (34) is connected to the piston (12) and is forcibly moved by the piston and is stationary on the device element (10B) with respect to the position of the syringe body (10). The injection device according to claim 4 or 5, wherein the injection device is suitable for cooperating while abutting to define a first injection end position.   The blocking member (34) is suitable for being separated from the piston (12) or being displaced from the position of the piston, thereby allowing the second injection end position to be reached. Item 7. The injection device according to Item 6.   The trigger member (30) is fixed to the drive head (12B) of the piston (12), and at the inhibition position, the inhibition member (34) is connected to the head (12B). The injection device according to claim 6 or 7.   9. Injection device according to claim 8, characterized in that, in the blocking position, the blocking member (34) penetrates the drive head (12B) of the piston (12). A safe injection device comprising a syringe and a safety means, wherein the syringe moves in the syringe body (10), the needle (11), and the piston (12) suitable for injection within the body. Wherein the safety means comprises a protective sheath (16), the syringe body and the protective sheath (16) being suitable for sliding relative to each other to travel between the injection shape and the protection shape, The needle (11) protrudes beyond the protective sheath (16) disposed around the syringe body (10), and in the protective shape, the needle is inside the sheath, and the injection device A trigger member (30) suitable for moving the injection device from the injection shape to the protective shape at the end of striking,
The trigger member (30) is formed by a skirt fixed to the piston head, and the injection device includes an obstruction member formed by a part (34), wherein the member is in an obstruction position at the piston position. Attached to the head (12B) to form a distal end (38A), said distal end being suitable for abutting an element stationary relative to the position of the syringe body to define a first injection end position for the piston Also suitable for being pulled away from the piston head and thereby reaching a second injection end position of the piston, in which the skirt (30) causes the injection device to Not suitable for transitioning from the injection shape to the protective shape, in the second position, a skirt (30) moves the injection device forward from the injection shape. Injection device, characterized in that suitable for shifting to the protection shape.   11. The injection device according to claim 10, characterized in that, in the blocking position, the blocking component (34) penetrates the head (12 </ b> B) of the piston. A safe injection device comprising a syringe and a safety means, wherein the syringe moves in the syringe body (10), the needle (11), and the piston (12) suitable for injection within the body. Wherein the safety means comprises a protective sheath (16), the syringe body and the protective sheath (16) being suitable for sliding relative to each other to travel between the injection shape and the protection shape, The needle (11) protrudes beyond a protective sheath (16) disposed around the syringe body (10), and in the protective shape, the needle is placed inside the sheath and the injection device is injected A trigger member (30) suitable for moving the injection device from the injection shape to the protective shape at the end of striking,
The injection device includes means (34, 50) for defining first and second injection end states, and in the first state, a trigger member (30) injects the injection device into the injection device. Not suitable for shifting from shape to the protective shape, and in the second state, the trigger member (30) is suitable for moving the injection device from the injection shape to the protective shape, the trigger member (52) is connected to the piston (12) and is offset from the position of the piston and is suitable for moving between a position suitable for triggering and a position not suitable for triggering, In a position suitable for the trigger, at the end of the piston stroke, the trigger member (52) is suitable for moving the injection device from the injection shape to the protective shape and not suitable for the trigger. In, on injection striking end of the piston, the trigger member (52), injection device, characterized in that said injection device from the injection shapes unsuitable for shifting to the protection shape.   A trigger member (50) is axially movable relative to the position of the piston (12), and a position suitable for the trigger is from a position not suitable for the trigger from the position of the piston (12). 13. Injection device according to claim 12, characterized in that it is offset towards the needle end (12A).   Hard points (53, 54A, 54B) for holding the trigger member in a position not suitable for the trigger are included within the range of sliding movement of the trigger member (50) relative to the position of the piston (12). The injection device according to claim 13.

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